java - 基本类型数组如何转ArrayList?

Question

Arrays.asList 可以用在对象上，但基本类型就出错了。

byte b[]=new byte[3];
b[0]=1;
b[1]=2;
b[2]=3;
ArrayList<Byte>bytes=new ArrayList<Byte>();
bytes.addAll(Arrays.asList(b));

这个提示错误

我想让 byte[] 数组 转换成 ArrayList ，这个可以实现么？
还是需要先转换成 Byte[] 数组 再转换成 byte[] 才能实现呢？

Answer 1

As simple as it comes. java autoboxing.

        for(int i=0;i<b.length;i++){
            bytes.add(b[i]);
        }

---

Latest addition

I recently used Arrays.asList() and found that if its parameter is a basic type array, this is the error message;

Multiple markers at this line
    - The method addAll(Collection<? extends Byte>) in the type ArrayList<Byte> is not applicable for the arguments 
     (List<byte[]>)

In other words, it treats the basic type array as a List<type[]>, that is, as a whole object.

Another modification method is to change byte[] to Byte[], so that it can run normally. In other words, the parameter received by asList() should be an object array;
If the parameter is an array of basic types, it will be treated as an object array with only one element (that is, the element is an array of basic types).